Machine for grinding rollers.



O. A. SCHMIDT.

MACHINE FOR GRINDING ROLLERS.

APPLICATION FILED FEB.16k1912.

1,055,808. Patented Mar. 11, 1913.

SSHEETS-SHEET 1.

O. A. SCHMIDT.

MACHINE FUR GRINDING ROLLERS.

APPLKLATIUS F1LEDIEB.l6, 912.

1,055,808, Patented Mar. 11, 1913.

3SHEETSSHEET 2.

0. A. SCHMIDT.

MACHINE FOR GRINDING ROLLERS.

APPLICATION FILED FEB 16, 1912 Patented Mar. 11, 1913 3 SHEETS-$531K 3Wu nesses.

I r Zii/fentm: I, 7 544%,. M, yn W UNITED s 'rEs PATENT OFFICE. I

OTTOhAiiWIN SCHMIDT, F CHELMSFORD, ENGLAND, ASSIGNOR TO T HE HOFFMANNMANUFACTURING COMPANY LIMITED, 01? LONDON, ENG LAIN'D.v

MACHINE FOR GRIND'ING RoLLEns.

Specification of Letters Patent.

- Application am; February 1 1 12, Serial No. 678,017.

To all whom it may concern:

Be it known that I, OrroAnwin a subject of the German Emperor, residingat Chelmsford, in thecounty of EsseX,.Eng-.

land, have invented a certain new and useful Improvement in -Machinesfor Grinding- Roller-s, 0t which the following is a specification.

This invention relates to a machine ,or device for grinding the cornersof rollers such as those used in roller bearings, the object of samebeing to grind the corners to a radius or curve though it 'may beadapted to provide them with a chamfer or an le or angles at theircorners while the re lers are in movement through the machine.

It has been found highly move the sharp angles at the ends of therollers when they terminate in the usual right angle faces and provide'a radius because even the obtuse angles left with a chamfer ifa mereangle say of 45-- is removed may still operate in the bearing to effecta cutting of the roller race or to effect damage to the roller. .Toobtain such a radius. or a chamfer and other ends one form ofmaehiue ordevice for exa'mple according to thepresent invention'is provided with amovable grinding member, preferably a disk,

horizontally arranged and formed :of a grinding material or capable withthe addition of a suitable material of effecting the grinding and aguide or holding device for presenting the rollers to the face of same,which guide is preferably a channel having, according to requirements,two, threeor four sides orportions of sides adapted to closely hold andcontrol the rollers so that they have a rolling movement of progressionor a partial rolling movement'therein. The guide in. question preferablypresents the 'periplr cries of the rollers in the first instance to thegrinding face and then has a gradual twist given to it so that onecorner only of the rollers is presented to the grinding face the twistas the rollers progress gradually tilting them until the desired radiusor curve,

for example a quarter twist is attained when the rollers may pass awayfrom the grinding face, or the twist may be reversed or continued toallow them to be further acted upon. .it being desirable in any casethat the rollers pass to a transferring device which takes them fromtheexit end of the grind desirable to reing face to ,the'entranee endagain as several passes may be necessary to obtain the requiredreduction.

Another form of" machine or device is adapted to grind a chamferor aleon the roller after it has been given a. su den twist by the holder aslong as desired after whichthe roller is given. a further twister twiststo grind the'next cor-ner and $0 on. The twi may be effected in a fixedholder hay inga twisted channel or in a straight chanof asuitable-rocking or other. movement or in a combined straight andtwisted channel in a rocking or like holder.

Embodiments of theabove and other features of the invention areillustrated in the accompanying drawings in which:-

Figure 1 is an elevation partly in section of a machine having a twistedchannel which is arranged in the form shown for radius grinding. Fig. 2is anend elevation partly in section on line u-u Fig. 1.

Fig. 3 is a cross section oxran enlarged scale'of apart.

Patented Mar. 11, 1913.-

nel or channels carried by aholder capable I of Fig. 1 on line 'v-v.Fig. 4 is a cross sec- 7 tion on anenlarged scale of apart ofi-Fig. 1 online ww. Fig. 5 is a cross section on an enlarged scale of a part ofFig. 1 on line ac w. Fig. (3 is a similar view to Fig. 1 of a machinefor chamfer grinding. Fig. 7 is an end elevation partly in section online tt Fig. 6; Fig. 8 is a cross section on an enlarged scale of a partof Fig. 6 on line ;1 y. Fig. 9 is a similar view. to Fig. 1 of a machinehaving a rocking holder arranged in the form shown for radius grinding,and Fig. 10 is an end elevation partlyfin section on line ss Fig. 9.Figs. 11 tol fiare cross sections on an enlarged scale to Show differentpositions of the same roller in tlierocking holder; Fig. 13 being asection on the central position on line zz ofFig. 9 to'. show the holderand the section .Of the grinding disk at this point. The views Show thesame roller at different positions" in the holder in order to illustratethe grinding operation, and not sectional views of the holder in thesame or stationary position throughout.

Referring to Figs. 1 to 5 the grinding disk 1 is suitably supportcdabovea channeled holder 2 by adjustable devices now well known in connectionwith such grinding disks a part of such adju$ting devices aving agradual twist from the point where it enters beneath the disk to itsexit point that isifrom a-somewhat greater distance than that betweenthe' section lines 1) to m respectively the twist being approximatelyOVCIatL'QllEtItBI of the roller 3 to be acted on.

It is desirable in forming this. twist in the, holder that the corner ofthe roller to beaeted upon remains in the same plane throughout.Preferably the twist is so. ar-

, ranged that the rollers 3 (which travel in close succession) enter anintroductory part 2 of thechannel beneath the disk with theirperipheries on the same plane as the latter as seen in the end view Fig.2 that bein the position they have 'in the traveling ro ling movement inthe transferring device hereinafter described, and immediately commenceto resent their corners to the action of the dis as'show'n in Fig. 3 andgradually turn over until they occupy the positions shown as examples inFigs. i and 5. At the exit point from beneath the disk the channelcommences another quarter twist from about the point 4 to about the}point 5 in the part 2 Fig. 1,50 as to bring the rollers again into theirtrue rolling position in the channel to enable them to move easilythrough the transferring device. This transferring device may be eitherwith or without a mix-' ing device, that shown hasnone and consists onlyof a channel. 7 connecting two channeled driven wheels 8 8 having springpressed semi-,circular cov r plates 8 8 such wheels on their. lower sidies communicating with the channeled holder 2 2. By this means therollers are carried in succession around again to the entrance end ofthe disk where the next corners are presented to the grinding action.

.T he grinding disk is provided with screw means for raising andlowering it, or for exerting a spring pressure on the rollers such meansbeing of thecharacter employed in ball rinding' machines having twogrind- ,ing dis s, usually vertical where one" is required to exert aspring pressure and to be withdrawn and replaced. The wheels 8 8 arealso suitably driven from sprocket wheels 9 and chains andgears (notshown) to provide a positive propulsion for the.

rollers as this is generally desirable.

The holder 2 is in the case illustrated provided with three supportingsidesfor the rollers as shown in Figs. 3 to 5. i

,The construction shown in Figs. 6 to 8' is similar as regards the mainpart of the machine but the twist say of 45 given to the channel in theholder 2 commences at about the point 10 and ends-at about the point 11so that the corner of the roller is presented suddenly to the grindingdisk across the face of which it travels without change until {the exitwhere from about the point 12 to the point 13 in the part 2 the channelhas another reverse twist of 45 to bringit back into rolling positionafter which it has a half twist in the-channel 7 of the transferringdevice from sa the point 14 to the point- 15 to complete y rener may beacted u on during its next fpass beneath the grinding disk. The rollerholder 2 at the point where the'rol ler is being acted upon by the diskis preferably provided with four sides as shown so as totally supportthe roller 3, two of the sides bein formed by a cover plate 16 Fig. 8.

The construction shown in Figs}? to 1-5 is similar as regards the.grinding disk and transferring device except that ahopper 17 is shown inthe latter forv mixing the rollers in their order 1 of progressiori-fiorfilling them into the channel and *fo'r other purample ofone which issuitable for all forms of the machine shown. The main holder 2 for therollers has in these figures aslow rocking movement given to it so thatthe zdesired complete radius at once commences to be action df thegrinding disk. This rockin end in bearings 18, 18, by hollow gudgeons19, 19 with which connect ortions 20, 20 or continuations of said holer. tions 20, 20 are connected with'fixed parts 2 and may be made offlexible tubing having internal dimensions; suitable for the rollers, orof four-metallic strips or wires as indicated or in other ways so thatthey will follow themovement of the rocking holder and receive therollers anddeliver The-rocking motion is shown as obtained from cranks21, 22 and connecting rod 23 from a shaft 24 which is suitably drivenand the holder has in its central portion a the position of the rollers.

It is desirable to support the rollers 3 on three sides but it is alsonecessary to expose suflicient radius may be obtained. To this endtherocking holder is formed with a casev the periphery and a sutlicientport-ion of the end of the roller to allow of the corthrough an arc of45 backward and forward so that referring toFigs. 11 and 12 which showthe first or entering part- 25 of the holder channel it' will beseenthat in such part a radius will be obtained com mencing at theperiphery of the roller and leaving off when the holder has arrived atverse its position whereby the opposite cor roduced while the rollersare undei' 'the gl 5 holder as shown extends outside the full diameter.of the disk and is carried at each These porthem from and to thecarrying wheels 8.

twisted center channel 26 which can change channel as shown inFig.11exposing in this I poses, such hopper being given as an extheperiphery as Well as one end so that a ner being exposed, and suchholder moves 6 corner of the roller the end of the amount of its angularmovement as above. This being done it is necessary to expose the end andgrind the rest of the radiuson same up to the point on the where thefirst part of the radius ceased. This is effected by providing in theholder the twisted center channel in Fig. 13 which can change therollers in their travel from the position shown in Figs. 11 and 12 orthe entering part to that shown in Figs. 14 and 15 or leaving part 27,so that the end which was previously covered is now fully exposed.

The tw t in the part :26 Fig. 13 is effected without the roller beingacted upon by the disk as the part 26 is located beneath the opening.orinternal diameter 28 usual in grinding disks of this character. Thefigure shows the roller in an intermediate position, it having twistedaround half of 45. In doing this the sides of the roller groove havealtered their shape as the one on the periphery is growing and the oneon the end is disappearing, though the cross section of the rockingholder otherwise does not alter, it being preferably a bar throughoutfrom the entering to the leaving end with two faces at 135. The grooveor channel so arranged in the bar that the corners of the rollers arekept in the same plane. From the po ition in Fig. 14 it is necessary ordesirable to turn the roller into a true rolling position again, andthis is effected by a twist in the channel of the holder asindicated.'at 29. After being carried around given a half twist in thechannel 7 of the transferring device to reverse them, so that the othercorner is acted upon at the next. pass. It will be understood that someof the reversals of position of the rollers required in the aboveconstruction can be ef fected in other ways and at other points as twistto any amount could be arranged to take place while the rollers areunder the action of the grinding member as for example by dropping theholder below its normal plane so that the roller is not touched by thegrinding men'iber while being turned or reveised. Also, that accordingto the form or arrangement of the guide or holding device, either acorner or both corners of the roller may be ground to a radius, or theentire cud, or both ends.

The machines or tlvvices may be combined with one for grinding theperipheral faces of the rollers where he rollers have a true rollingmotion of progression as in .ipt-citi cation No. lti5TTtL-2bth .inlyltlltl the rollers while passing a ross one part or chord of the face ofthe grinding member or dist: being acted "upon peripherally and whilepassing: across another part or chord being acted \ipou at theircorners.

It is known to carry needles in a posiby the wheel 8 at this end, therollers are l l l l tivcl'y rotating holder adapted to carry them pastthe angled corner of a grinding disk so as to remove the bur from theirheads and also to grind a groove in rollers near their beads bypositively rotating each in a series between a driven disk and a fixedpart. against the action of a rotating grinding disk.

Various modifications may be made in the invention over theconstructions described such for instance as in the multiplication ofthe channels, or in the guiding of the freely moving rollers, themachines illustrated being examples of some suitable for acting upon thecorners of rollers while having a traveling rolling or partial rollingmovement through the machine.

What I claim is 1. A machine for grinding the corners of rollers to aradius, curve, orangle comprising in combination a framework, a holdercarried by said framework, provided with a channel in which the rollersare accurately but freely held and capable of moving with a cornerexposed and a rotatable grinding disk to which such roller corner ispresented and which both grinds and imparts a traveling movement to therollers.

2. A machine for grinding the corners of rollers to a radius, curve, orangle, comprising in combination, a framework. a holder carried by saidfran'iework provided with a channel in which the rollers are accuratelybut freely held and capable ofunoving with a corner exposed, means forvarying the angle of such channel and exposed corner, and a grindingmember to which such roller corner is presented.

3. A machine for grinding the corners of rollers to a radius, curve, orangle, comprising in combination, a holder provided with a channel inwhich the rollers are accurately but freely held and capable of movingwith a corner exposed said holder having a twist in the channel Qf sameto vary the angle of such exposed corner, and a grinding member to whichsuch roller corner is presented.

4r. machine for grinding the corners 0t rollers to a radius, curve, orangle, comprising in combination a holder in which the rollers areaccurately but freely held and capable of moving with a means forrocking such holder to vary the angle of the corner exposed and agrinding member to which such roller corner is pre sented.

5. A machine for grinding the corners of rollers to a radius, curve. orangle, comprising in combination channel in which the rollers areaccurately but freely held and capable of moving with a corner exp sed.means for rocking such holdct: toWary the angle of the corner exposed. atwisted portion in the channel of such holder to fully grind the radiuscurve a holder provided with av IUt) corner exposed,

on said corner, and a grinding member to t which such roller corner ispresented.

6. In a machine for grinding the corners of rollers to a radius, curveor angle. itlltl in 5 combination a rocking holder provided \filllachannel in which the rollers are accurately but freely held and capableof traveling With acorner exposed, a grinding member for acting on suchcorner and a, clevice for introducing the rollers to the removing themtherefrom in their travel, such device being attached to the holder andcapable of moving therewith.

7. In a machine for grinding the corners of rollers to a radius, curveor angle, and in combination, a holder in which the Pollen j areaccurately but freely held and capable i of moving With a cornerexposed, :1 g im? ing member to which the corner is IJXtESttllQtl andmeans outside of that part of the holder 1 holder and for eas es when tothe grinding a twist to the roller. mine tor grinling the corners 2recline t-IIYL an angle, and in mtiotr 3t tol-iier in which the rollersale accurately nut f et-13' held and capable Whit a oi'titr expoeed agrinding L h th miner is presented, rs from the 1 holder, and rollers inorder of 'iereunto set 11 m ni e i no subscribing lit Y hand in th Wtiles-we,

